Portable Low Cost Data Loggers Part of the NOMAD® Family
State Logger, Motor On/Off Logger

OM-50 Series

Portable Low Cost Data Loggers Part of the NOMAD®  FamilyState Logger, Motor On/Off Logger | OM-50 Series

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  • Model OM-51 Monitors Contact Closures
  • Model OM-52 for Motor On/Off Applications
  • Easy-to Use Windows Software


OM-50 Series data loggers record when devices change between on and off or open and closed states and store the time, date and state for each change (the black arrows in the diagram below show when data is recorded).

These data loggers have two LED indicator lights, one red and one green. One of these LEDs will blink every two seconds. If the contact is open or the device is off, the red LED will blink. If the contact is closed or the device is on, then the green LED will blink. Although the LEDs blink every other second, the state is checked every half second, with state changes recorded as detected. Simply connect the data logger to your PC using the RS-232 cable and download stored data using the Windows software.

Model OM-51 State data logger has two inputs, a magnetic reed switch located in the middle of the hinge of the case (opposite the connectors), and an external contact closure input. The data logger records contact closures/openings of its internal magnetic reed switch and contact closures (open/shorted) in a cable connected to its 2.5 mm stereo jack. The OM51 data logger detects the cable's open/shorted condition by applying a positive voltage pulse to the tip (white wire in the cable).

Model OM-52 Motor On/Off Data logger uses an AC magnetic field threshold sensor to determine if a motor is on or off. The AC magnetic field threshold is approximately 2 Gauss at 60 Hz. Position the logger so that its green LED blinks when the motor is on. is usually best to mount the data logger on the side of the motor.


OM-51 STATE DATA LOGGER Inputs: two inputs; a magnetic sensor mounted in the datalogger and an external cable for detecting contact closures (external cable is included).
Spacing Between Data logger
and External Magnet:

closed, less than or equal to 3/4"; open, greater than or equal to 3/4" (external magnet is included)
External Contact Input: passive relay switch or contact closure

Sensor Type: AC field sensor Magnetic Field Threshold: approx. 2 Gauss at 60 Hz; the logger will typically work with AC motors drawing 1A or more
Mounting: mount the data logger on or close to the motor housing or to one phase of the power line to the equipment being monitored
Angular Response: the datalogger is sensitive to that part of the AC field that is perpendicular to the data logger's face


Measurement Capacity:
2000 state changes
Time Resolution: 0.5 seconds Minimum State Duration: 0.5 seconds
Memory Modes: stop when full, wrap-around when full (user selectable)
Memory: non-volatile EEPROM memory retains data even if battery fails
Operation: blinking LED lights show current state
Time Accuracy: ±1 minute per week at 20°C (68°F)
Operating Temperature:
-20 to 70°C (-4 to 158°F)
Operating Humidity:
0 to 95% non-condensing
Storage Temperature:
-20 to 70°C (-4 to 158°F)
Power: 3.6 V lithium battery
Battery Life: 1 year
2.4"H x 1.9"W x 0.8"D
(68 x 48 x 19 mm)
Weight: 1 oz (29 g)


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